Mold for culvert, sewer, and other pipes.



PATENTED OCT. 17, 1905. J. ROBINSON. MOLD FOR OULVERT, SEWER, AND OTHERPIPES.

APPLICATION FILED 13110.22, 1904.

H I M A x MW? 1 L I H B A B 52 H A I1 I IIIII|IIIIII I I O \I I T0 (1 77- whnm, it may concern.-

cured to a canopy-top for the core.

JOHN ROBINSON, OF HAMILTON, CANADA.

MOLD FOR CULVERT, S EWER, AND OTHERPIPES.

Specification of Letters Patent.

Patented Oct. 1'7, 1905.

Application filed December 22, 1904. Serial No. 237,984.

Be it'known that I, JOHN ROBINSON, a citizen of Canada, and a residentof Hamilton, in the county of \Ventworth and Province of Ontario,Canada, have invented new and useful lmprmements in Molds for Culvert,Sewer, and other 1ipes,.of which the following is a specification.

My invention relates to molds for culvert, sewer, and other pipes inwhich a reversible base is introduced to support a hinged sheetmetalcylindrical body part and core and a removable flared top for said bodypart se- The objects of my invention are, first, to

provide a mold having a removable and reversible base adapted to formpipes with telescope ends and pipes with flat ends; second, to provide amold with a flared top and the hollow core with a canopy-top to affordfacilities for filling in the concrete between the body part or outershell and the core, and, third, to provide means to center the core withthe shell. I attain these objects by the mechanism illustrated in theaccompanying drawings, in which- Figure 1 is. an elevation of the moldwith the base in position to form a telescope end to the concrete pipe.Fig. 2 is a sectional elevation of the same, showing the longer end of apipe. Fig. 3 is a sectional elevation of the lower part of the mold. theremovable base part being reversed to form a flat or plain end to thepipe. I

Similar characters refer to similar parts throughout the several views.

In the drawings the body part or outer shell of the mold-is indicated byA and is made of sheet metal in halves, which are hinged together at Band fastened at the opposite vertical joint, as at O. The shell A, thehinges B, the fastening O, and the vertical hollow core D are not new.

E is the concrete pipe between the shell A and the core D.

In Fig. 2 of the drawings the base F is circular and has an annularflange 2, on which stands the lowerend of the shellA. The inner part ofsaid lower end fits around the annular step-flange 30f the base F. Anupwardlyextending rim 4 extends from the flange 3, the inner side ofwhich fits the outer part of the hollow core D. The lower-end of saidcore rests on the internal flange 5, which is inhorizontal line with theflange 2. The outer part 6 of the rim 4- is less in diameter than thediameter of the inner side of the shell A in order to form space betweenthe shell A and said rim for the telescope end of the molded pipe E.

It will be noticed in Fig. 3 of the drawings that the base F is reversedor upside down and standing on the rim 4. The shell A in this view isshown standing on the flange 2 and around the annular step-flange 3 ofthe base; also that the lower end of the hollow core stands on theinternal flange 5 and in the annular opening 7 similar to the annularopening 8 of the base. The upper surface 9 of the base in Fig. 2 of thedrawings forms a shoulder for the telescope end of the pipe E, and thesame surface 9 in Fig. 3 of the drawings is the standing bottom of thewhole molding device. The upper surface 10 of the base in Fig. 3 of thedrawings is the lower end of the molded pipe E, and the same surface 10in Figs. 1 and 2 of the drawings serves as the standing bottom of thewholemolding device.

It will benoticed that the lower end of the shell A and the lower end ofthe core D are on the same plane. This feature is important in that theupper ends of the shell and the core shall be the same distance apartand in the same relative position to each other whether the base F isplaced as in Fig. 2 or as in Fig. 3 of the drawings.

The upper end ofthe shell A is provided with a flared mouth-top H,having a lower annular flange 12, which fits into the upper end of theshell A and loosely connected therewith. The upper end of the hollowcore D is covered with a canopyJ with lower annular flange 13, whichfits loosely around the outer part of the core, thereby eompletel ycovering the upper end of the core. The flared mouth H and the canopy Jare secured together by means of a number of brace-straps 14, which arerigidly connected to said flared mouth H and canopy J and are adapted tobe lifted or removed together from off the mold. The brace-straps 14.serve the purpose of placing and retaining the upper end of the core Din an exact central position with the shell A. This feature is importantin order to produce a pipe of equal thickness around the body thereof.The flared part H of the top of the shell serves to facilitate theentrance of the soft material composing the concrete pi e while the sameis being molded, and the 110 canopy-cover J serves to prevent any ofsaid material from entering the hollow part or opening of the core.

What I claim as my invention, and desire to secure by Letters Patent, is

A mold for concrete pipes, eomprisingia cylindrical shell in two partsvertically joined together, hinges on one vertical joint, and afastening on the opposite vertical joint, a removable open and flaredtop resting on the shell; an annular flange on the lower part of theflared top loosely inserted in the shell,- a central verticalcylindrical core in and ex- JOHN ROBINSON.

Witnesses:

JOHN H. HENDRY, RICHARD BUTLER.

